The U.S. stock market on Friday posted one of its best weekly performances in years, recapturing half of the losses from the startling market correction earlier this month and discovering a new "wall of worry" to climb.

U.S. stocks are little changed Friday morning as gains by health care and technology companies are offset by losses in packaged food makers including Kraft Heinz and Campbell Soup, which reported disappointing results.

World shares were set to post their best week of gains in six years on Friday after two consecutive weeks spent in the red, shrugging off a rise in global borrowing costs while the dollar hit its lowest level since 2014.

Even though the stock market had an impressive reversal last Friday, many stock investors and traders have avoided buying stocks ahead of January's CPI report, released yesterday. But is each monthly report really that important in determining the health of the economy?